@munair & @OttoI thank you both for your suggestions. I will likely look into them sometime in the future but, I admit, not now.
Just FYI, I find browsers to be software that is _barely_ tolerable. It seems they (or the company that makes them) believe they "own" your computer.
I decided to go with Chrome because I know how to beat the thing into submission. To my satisfaction, it is currently complaining that it cannot update itself <that's because I neutered it ... no more territory marking in my computer... evil grin of satisfaction> and its "software reporter" thing has had its dna altered... it doesn't report much of anything anymore because it doesn't even get to run.
Adopting a different browser means I have to spend time figuring out the shenanigans it does and methods to make it behave. I'm sure eventually I will have to but, for now, Chrome is doing the trick ... no more line numbers when I select code snippets.